How do you make compound surfaces smooth for a wheel arch?


I’ve two different wheel arch paths on a car wing, the top of the arch and the bottom are slightly different in terms of path. In real life the body is molded in glass fibre and was faired in by hand and eye, I’d like to make a reasonable copy that is smooth if not an exact copy of the original. See below a screen shot of the original car and the screen shot of what I’ve done so far in SU. Can anyone tell me the simplest ways to join up my two different paths in a smooth and attractive fashion?

Merry Xmas!

<img src=“//” width=“690”


Hers the actual car.